CAMBRIDGE, Mass.--(BUSINESS WIRE)--Acceleron Pharma, Inc., a biopharmaceutical company developing novel therapeutics that modulate the growth of cells and tissues including red blood cells, bone, muscle, fat, and the vasculature, presented data demonstrating that ACE-536 promotes formation of red blood cells through inhibition of members of the TGF-beta superfamily, at the 51st Annual Meeting of the American Society of Hematology.